Patent US1935445A successfully refreshed from Google Patents.
US2899332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromizing method and composition
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
•
Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:21
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/28; C23C10/34; C23C10/36; C23C10/38; C23C10/40; C23C10/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF CHROMIZING FERROUS METAL PARTS, WHICH COMPRISES FIRST PREREACTING TOGETHER AMMONIUM BIFLUORIDE AND CHROMIUM TO FORM A COMPLEX COMPOUND OF AMMONIUM, CHROMIUM AND FLUORINE, DRYING THE COMPLEX COMPOUND AND THEN PLACING SAID DRY COMPOUND, CHROMIUM AND FERROUS METAL PARTS IN A CLOSED RETORT, WITH THE SAID COMPOUND AND THE SAID CHROMIUM IN CONTACT WITH THE FERROUS METAL PARTS AND MAINTAINING THE CONTENTS OF THE RETORT AT A TEMPERATURE BETWEEN 1650 AND 2300 DEGREES F.
Claim 2
Independent Claim
76 words
THE METHOD OF CHROMIZING FERROUS METAL PARTS, WHICH COMPRISES FIRST PREREACTING TOGETHER AMMONIUM BIFLUORIDE AND CHROMIUM TO FORM A COMPLEX COMPOUND OF AMMONIUM, CHROMIUM AND FLUORINE, DRYING THE COMPLEX COMPOUND AND THEN PLACING SAID DRY COMPOUND, CHROMIUM AND FERROUS METAL PARTS IN A CLOSED RETORT, WITH THE SAID COMPOUND AND THE SAID CHROMIUM IN CONTACT WITH THE FERROUS METAL PARTS AND MAINTAINING THE CONTENTS OF THE RETORT AT A TEMPERATURE BETWEEN 1650 AND 2300 DEGREES F.
References Cited (Backward Citations)
US1853369A
Cited
US2046638A
Cited
US2157594A
Cited
US2536774A
Cited
FR1012401A
Cited
US2816048A
Cited
FR1075620A
Cited
US2811466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |